SMTP stands for Simple Mail Transfer Protocol. SMTP is a set of communication guidelines that allow software to transmit an electronic mail over the internet is called Simple Mail Transfer Protocol. It is a program used for sending messages to other computer users based on e-mail addresses.
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smtp-ntlm-info.nse
This script enumerates information from remote SMTP services with NTLM authentication enabled. Sending a SMTP NTLM authentication request with null credentials will cause the remote service to respond with a NTLMSSP message disclosing information to include NetBIOS, DNS, and OS build version.
script: sudo nmap — script smtp-ntlm-info <target>
smtp-enum-users.nse
Attempts to enumerate the users on a SMTP server by issuing the VRFY, EXPN or RCPT TO commands. The goal of this script is to discover all the user accounts in the remote system.
script: sudo nmap — script smtp-enum-users <target>
smtp-brute.nse
Performs brute force password auditing against SMTP servers using either LOGIN, PLAIN, CRAM-MD5, DIGEST-MD5 or NTLM authentication.
script: sudo nmap — script smtp-brute <target>
smtp-commands.nse
Attempts to use EHLO and HELP to gather the Extended commands supported by an SMTP server.
script: sudo nmap — script smtp-commnads <target>
smtp-strangeport.nse
Checks if SMTP is running on a non-standard port. This may indicate that crackers or script kiddies have set up a backdoor on the system to send spam or control the machine.
script: sudo nmap — script smtp-strangeport <target>
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